Tailstock center attachment for bench lathes



Feb. 15, 1944.

J. KoENps TAILSTOCK CENTER ATTCHMENT FQR BENCHLATHES Filed Oci. 9. 1942 nwEN'roz;

me@ ATTO RNY Patented Feb. 15, 1944 UNITED STATES PATENT OFFICE 'rArLsToonoEN'rEn ATTACHMENT Fon BENCH LA'rHEs y ilakoblKoenig, Union City, N. J. Applicaticn'ctober 9, 1942, Serial No.'461,426

4' claims. (ci. ca -33') This invention relates to' new .and useful .improvements in a tail stockcenter attachment for bench lathes.

More specifically, the invention proposes the construction of ataillstockcenter attachment for bench lathes characterized bya holder adapted to fit the `tail stock of a conventionally constructed bench lathe and which is provided With a reamed aperture into Which'adesired center of a set of centers is adapted to be engaged in a manner to adapt'the holder to accommodate work of different types.

Heretofore, in constructing tail stock centers it has been the practice to form the centers of a size to engage the tail stock of the lathe. This invention proposes the saving of time and saving large quantities of tool steel by providing a single holder engaging-With the tail stock'of the bench lathe and-arranged to selectivelyreceive `onev of a plurality of small centers to adapt the holder as above described. l

A further object of the invention proposes a novel means for releasibly holding the centers in position lWithin the holder in a manner to permit the centers to be quickly changed when desired.

It is a further object of this invention to construct the centers of different shapes interchangeable With the holder in a mannerto permit the lathe to be quickly' setup to accommodate different types of work.

A still further object of theinvention proposes a means for adjustablymoun'ting the means for releas'ibly holdingthe centers in position Within the holder in` a manner to permit this means to be adjusted to meet the requirements oi centersV of different lengths.

For further vcomprehension ofthe invention, and of the objects and advantages thereof, reference will be had to the followi'ngdescription and accompanying drawing, and to the appended claims in which the various novel features of the invention are more particularly set forth.

In'the accompanying drawing forming a material part of this disclosure:

Fig. l isa side' elevational view of a holder for bench lathesconstructed in accordance with this invention.

Fig. 2 'is an enlarged vertical sectional View on the line 2-2 of Fig. 1.

Fig. V3 is a perspective view of the center shown in Fig. 1.

Fig.- 4 isa view similar to Fig. 3 but illustrating a center of a slightly different shape.

Fig.r5 illustrates thefmanner'inl which the centers shown in Figs. 3 and 4 are adapted to be-us'ed.

Fig. 6 is a Asidelelevational view of a female center.

Fig. 7 is a view illustrating the manner in which the center shown in Fig. 6 is adapted to be med.

Fig. 8 is a perspective View of still anothercenter adapted to be used in the holder shown in Fig. 1.

Fig. 9 is a view illustrating the manner in which the center shown in Fig. 8 is used.

Fig. 10 is a side elevational view of still another center used for grinding.

Fig. 11 is a similar vievv to Fig. 10, showing the same center used in a bench lathe.

Fig. 12 is a side elevational vieW of still another center.

Fig. 13 is a sectional view taken substantially on the line I3-I3 of Fig. 12.

Fig. 14 illustrates one manner of using the center shown in Fig. 12.

Fig. 15 is another side elevational Avievv of still another center.

Fig. 16 is a side elevational View similar to Fig. l but illustrating a modification of the invention.

Fig. 17 is an enlarged vertical sectional view ltaken substantially on the line I'l-I'I of Fig. 16.

The tail stock center attachment for bench lathes, according to this invention, includes a holder I Il formed of cold rolled steel or other suitable unhardened metal and which has a head portion II and a smaller tapered shank I2 which is adapted to t the tail stock of a conventional bench lathe. The holder I0 has a reamed aperture I3 extended inwards from one end of its head portion and which continues into a smaller aperture Ill extending through the shank l2.

A set of hardened tool steel centers are adapted to be selectively engaged in the roamed aperture I3 and means is provided for releasably holding the desired center in position within the roamed aperture I3. This means comprises a pair of set screws I5 threadedly engaged through one side of the head portion II of the holder I. The set screws I5 are so arranged that their inner ends will bear against the at portion of the tool, engaging into the aperture I3 and securely hold it in position therein.

The set of centers and the manner in which they are to be used in connection with the holder In Fig. -5, the center It is illustrated engaging oneend of a piece of work I9 mounted in a bench lathe and a micrometer 20' is illustrated as it Wouldb'e used for measuring" the diameter of the end portion of the Work I9. Reducing the size of the tip I8 of the center I6 permits the micrometer 20 to be more easily engaged with the end portion of the work I9 without removing the work from the centers. In Figs. 6 and 7 the center I6 is characterized by a shank portion Hb which is engageable into the reamed opening I3 of the holder IIJ and which is provided at each of its ends with female centers Il!h and ISC. The center i6" is adapted to be engaged with the holder I with either of its ends directed outwards to engage the reduced end of a piece of work 2l, as shown in Fig. 7.

In Figs. 8 and 9 a tubular center 16 is illustrated which is adapted to be engaged into the reamed opening I3 of the holder IE. This center IE'" is adapted to receive one end of a rod 22 which has its other end supported in a spring collar 23 mounted in the opposite end of the bench lathe. The rod 22 is adapted to be used for twisting small springs from a length of piano wire 24.

In Fig. still another center 16" is illustrated comprising of a shank portion Ilc and a shaped reduced portion Id which may be used with a grind-stone 24a. This center is shown with annular grooves N51 which may be engaged by the set screws I5 as shown in Fig. l0, or at a turned 188 position as shown in Fig. 11 for the use of cutting the work 25h by a cutting tool 'MC in a bench lathe.

In Figs. 12-14 still another center Im is illustrated comprising a holder 25 having a shank portion 2S engageable into the reamed opening I3 of the holder I0. The holder 25 supports a ball bearing ring 21 into which a shank 28 is projecting `from a disc 29 is adapted to extend, permitting the disc 29 to rotate freely independently' ci the holder 25. The disc 29 may be engaged against a piece of disc-like work 3! supported on the face plate 32 of the lathe, as shown in Fig. 14. This permits a cutting tool 33 to be engaged against the exposed face of the disc 3l to work thereon.

In Fig. 15 the disc 29 is illustrated to be in step formation and is adapted to be engaged into tubular work oi' various diameter. In other respects this form of the invention is similar to that shown in Figs. 12 to 14.

In Figs. 16 and 17 a holder SII is illustrated which has its rearmost set screw I5a adjustably supported to be movable relative to the length of the head portion Il of the holder to engage the rear end of cutting tools I6 of different lengths. The set screw I5 threadedly engages through a slide 34 mounted between a pair of shirns 35 mounted in position within an opening 3E formed in the head portion Il of the holder I9'. loosened condition of the set screw I5fl the slide 311 is movable to a desired position along the length of the opening 3S, and when the set screw I5a is retightened to engage the center I6 the slide 34 will also be securely clamped in its newly adjusted position.

In other respects this form of the invention is identical to the previous form and like parts are identied by like reference numerals.

While I have illustrated andv described the preferred embodiments of my invention, it is to be understood that I do not limit myself to the vpreoise constructions herein disclosed and the right is reserved to all changes and modifications coming within the scope of the invention as defined in the appended claims.

Having thus described my invention, what I Ina:

. claim as new, and desire to secure by United States Letters Patent is:

1. A tail stock center attachment for bench lathes having a holder adapted to fit the tail stock of a bench lathe and having a head formed with a reamed aperture into which a center is engaged, a set screw threadedly engaged through said head to abut said center adjacent its front end, a second set screw for abutting said center adjacent its rear end, and means slidably supporting said second set screw to be movable longitudinally relative to said center to be engageable with the rear end of said center regardless of its length.

2.. A tail stock center attachment for bench lathes having a holder adapted to fit the tail stock of a bench lathe and having a head formed with a reamed aperture into which a center is engaged, a set screw threadedly engaged through said head to abut said center adjacent its front end, a second set screw for abutting said center adjacent its rear end, and means slidably supporting said second set screw to be movable longitudinally relative to said center to be engageable with the rear end of said center regardless of its length, comprising tracks formed along the sides of an opening formed in said head, a slide slidably engaging said tracks and having said second set screw threadedly engaged therethrough to be movable to desired positions along the length of said opening.

3. A tail stock center attachment for bench lathes having a holder adapted to t the tail stock of a bench lathe and having a head formed with a reamed aperture into which a center is engaged, a set screw threadedly engaged through said head to abut said center adjacent its front end, a second set screw for abutting said center adjacent its rear end, and means slidably supporting said second set screw to be movable longitudinally relative to said center to be engageable with the rear end of said center regardless of its length, comprising tracks formed along the sides of an opening formed in said head, a slide slidably engaging said tracks and having said second set screw threadedly engaged therethrough to be movable to desired positions along the length of said opening, said tracks being formed in the inner faces of a pair of shims mounted along the sides of said opening.

4. A tail stock center attachment for bench lathes haviner a holder adapted to lit the tail stock of a bench lathe and having a head formed with a reamed aperture into which a center is engaged, a set screw threadedly engaged through said head to abut said center adjacent its front end, a second set screw for abutting said center adjacent its rear end, and means slidably supporting said second set screws to be movablelongitudinally relative to said center to be engageable with the rear end of said center regardless of its length, comprising tracks formed along the sides of an opening formed in said head, a slide slidably engaging said tracks and having said second set screw threadedly engaged therethrough to be movable to desired positions along the length of said opening, said second set screw when tightened against the rear end of said center also clamps said slide against the top walls of said tracks.

JAKOB KOENIG. 

